Fuse plug



March 31, 1931. J, 3 gHELLER 1,798,174

I FUSE PLUG Filed Nov. 25, 1929 2 Sheets-Sheet l feral?) March 31, 1931.J c SHELLER 1,798,174

FUSE PLUG Filed Nov. 23, 1929 2 Sheets-Sheet 2 ZiLUGILEI' Jom 625% outand Patented Mar. 31, 1931 UNITED STATES,

PATENT OFFICE JOHN C. SHELLEB, OI CHICAGO, ILLINOIS, ASSIGNOR OFONE-HALF T FRANK E. WHITE,

OF CHICAGO, ILLINOIS, AND ONE-HALF TO WALTER B. HINTZE, OI CHICAGO,ILLI- This invention relates to new and useful imgrovements in fuseplugs.

ne of the ob'ects of my invention is the rovision of a use plu providedwith an mexpensive fuse mem er, together with means providing anindicator to ascertain when the fuse is blown or destroyed so that itcan be easily replaced by a new one.

With the ordinary fuse plugs in use at the present time, itis ratherdifficult to ascertain, where a number of plugs are used in the samefuse box, which one of the plugs has been rendered useless throughblowing of the fuse,

and it is, therefore, necessary to test two or three of the plugs, as arule, before the blown plug can be located.

It is with the above objects in view that I have provided an improvedfuse plug having thereln a movable indicating member which is forcedoutwardly into indicating position when the fuse members are destroyed,so that when it is desired to replace the blown fuse, the partyreplacing the fuse can readily ascertain which one of the plugs has beenrendered useless.

With the above and other objects in view, the invention consists in thenovel features of construction, the combination and arrangement' ofparts hereinafter more fully set forth, pointed out in the claims andshown in the accompanyingdrawings wherein:

Figure 1 is a sectional view through my improved device showing itsattachment toa socket ping;

Figure B is an end elevation of the attachment; 7

Figure 53 a perspective view of the fuse memher; i

Figure iis a sectional view on the time 4% of 2, showing the fuse memberin operative position with the indicating eie inent its innermostposition; and,

Figure is a view simiiar to Figure 1 show in" the member as having beenbiovvn e indicating eiement in its outer most or i dicating positionReferring more particulariy to the drawings, indicates a socket plug andused in connection. with socket ping is an insuiated sheii. 53, havingreduced neck portion FUSE river Application filed November 23, 1929.Serial in. 409,255.

3, and provided on its interior with the shoulder portion 4 to which theblade members 5 are attached. These blade members 5 fit into the spacedreceiving portions provided for in the socket plug 1, and slidablymounted 13011 these blade members is the fuse mem- The fuse member 6comprises substantial-r 1y elliptical shaped end portions 7 each havinga transverse slot 8 to receive the blade members 5. The elliptical endportions 7 are integrally connected by means of the connecting stri orneck 9, said strip 9 bridging the connection between the blades 5 sothat this structure takes the place of the Well known fuse in use at thepresent time.

Slidably mounted within the neck portion 3. is an indicating pin 10which may be colored red or any other similar shade which would quicklyattract a persons attention with the inner end of the pin formed with anenlarged head portion 11. This head portion 11, when the plug is inoperation, as shown at Figure 1, normally rests against the connectingstrip 9, as shown in Figures 1 and 4. Therefore, should the fuse memberbecome-blown or severed, as shown in Figure 5, the force of theexplosion, due to the breaking of the strip 9 will force the pin 10 outvardly-to the position "shown in Figure 5,

and as there is a suflicient amount of friction between the walls of theneck 3 and the pin, the pin will be retained in its outermost positionuntil pushed inwardly again.

lit will. be apparent from the foregoing that with the use of a fuseplug of this type, the fuse members can be quickly and easily replacedby removing the insulating housing 2, and removing the broken fuse endsfrom the hlades 5, and positioning a new fuse .memher on the biades 5.It will also be simpie in its construction and can he mans inc low cost.

I claim: 1. In a fuse plu a body shell having a reduced neck, spacecontact blades carried by 2 said shell, a removable fuse member mountedupon said blades and a movable pin in the neck with its inner endnormally positioned against said fuse member and adapted to be rojectedthrough the neck when the fuse lows out, the pin being propelledoutwardly by the explosion at the time of the blowing of the fuse.

2. In a fuse) plug, a body shell having a restricted neck portion,spaced contact blades carried by said body shell, a fuse memberremovably positioned upon said blades, an indicator movable through therestricted neck portion, a head on the inner end of the indlcatornormally positioned in 4 contact with the fuse member whereby theexplosion resulting from the blowing of the fuse member will project theindicator out through the neck.

In testimony that I claim the foregoing I have hereunto set my hand atChicago, in the county of Cook and State of Illinois.

ZIOHN o. SHELLER.

